xml/students.xml <?xml version="1.0" encoding="UTF-8"?> <students> <student sn="1"> <name>张三</name> <age>18</age> <college leader="one">TingHua University</college> <telephone>01011111111</telephone> <notes>Best students!</notes> </student> <student sn="2"> <name>李四</name> <age>20</age> <college leader="two">BeiJing University</college> <telephone>01022222222</telephone> <notes>Better students!</notes> </student> <student> <name>王五</name> <age>22</age> <college>JiaLiDun University</college> <telephone>01033333333</telephone> <notes>Bad students!</notes> </student> </students>
1.Dom4jReadExample.java
package com.dom4j;
import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 利用dom4j解析XML
*
* @author Daniel Cheng
*/
public class Dom4jReadExample {
/**
* 遍历整个XML文件,获取所有节点的值与其属性的值,并放入HashMap中
*
* @param filename
* String 待遍历的XML文件(相对路径或者绝对路径)
* @param hm
* HashMap
* 存放遍历结果,格式:<nodename,nodevalue>或者<nodename+attrname,attrvalue>
*/
public void iterateWholeXML(String filename, HashMap<String, String> hm) {
SAXReader saxReader = new SAXReader();
try {
Document document = saxReader.read(new File(filename));
Element root = document.getRootElement();
// 用于记录学生编号的变量
int num = -1;
// 遍历根结点(students)的所有孩子节点(student节点)
for (Iterator<?> iter = root.elementIterator(); iter.hasNext();) {
Element element = (Element) iter.next();
num++;
// 获取student节点的sn编号属性的值
Attribute snAttr = element.attribute("sn");
if (snAttr != null) {
String sn = snAttr.getValue();
if (sn != null && !sn.equals("")) {
hm.put(element.getName() + "-" + snAttr.getName()
+ num, sn);
} else {
hm.put(element.getName() + "-" + snAttr.getName()
+ num, ""+(num+1));
}
} else {
hm.put(element.getName() + "-sn" + num,""+(num+1));
}
// 遍历student结点的所有孩子节点(即name,college,telephone,notes),并进行处理
for (Iterator<?> iterInner = element.elementIterator(); iterInner
.hasNext();) {
Element elementInner = (Element) iterInner.next();
if (elementInner.getName().equals("college")) {
hm.put(elementInner.getName() + num, elementInner
.getText());
// 获取college节点的leader属性的值
Attribute leaderAttr = elementInner.attribute("leader");
if (leaderAttr != null) {
String leader = leaderAttr.getValue();
if (leader != null && !leader.equals("")) {
hm.put(elementInner.getName() + "-"
+ leaderAttr.getName() + num, leader);
} else {
hm.put(elementInner.getName() + "-"
+ leaderAttr.getName() + num, "leader");
}
} else {
hm.put(elementInner.getName() + "-leader" + num,
"leader");
}
} else {
hm.put(elementInner.getName() + num, elementInner
.getText());
}
}
}
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[]args){
HashMap<String, String> hm=new HashMap<String, String>();
new Dom4jReadExample().iterateWholeXML("xml/students.xml",hm);
System.out.println(hm.size());
System.out.println(hm.toString());
}
}
2.Dom4jXML.java
/*用dom4j生成xml*/
package com.dom4j;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
public class Dom4jXML {
/**
* 利用dom4j生成XML
*
* @author Daniel Cheng
*/
public void createXML() {
//用工厂类创建一个document实例
Document doc = DocumentHelper.createDocument();
//创建根元素emps
Element rootEle = doc.addElement("emps");
//添加注释
rootEle.addComment("这是一个dom4j生成的xml文件");
//emps根节点下创建一个emp节点
Element empEle = rootEle.addElement("emp");
//emp添加属性id="1"
empEle.addAttribute("id", "1");
//emp节点下创建一个name节点
Element nameEle = empEle.addElement("name");
//name节点下创建一个文本节点zhangsan
nameEle.setText("Daniel Cheng");
//再为name节点创建一个兄弟节点
Element sexEle = empEle.addElement("sex");
sexEle.setText("man");
//将document中的内容写入文件中
try {
Writer out = new FileWriter("xml/emps.xml");
//格式化输出,类型IE浏览一样
OutputFormat format = OutputFormat.createPrettyPrint();
//OutputFormat format = OutputFormat.createCompactFormat();
format.setEncoding("UTF-8");
//创建写出对象
XMLWriter writer = new XMLWriter(out,format);
writer.write(doc);
writer.close();
System.out.println("生成emps.xml成功。");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("失败了。");
}
}
public static void main(String[] args) {
new Dom4jXML().createXML();
}
}
xml/emps.xml文档内容 <?xml version="1.0" encoding="UTF-8"?> <emps> <!--这是一个dom4j生成的xml文件--> <emp id="1"> <name>Daniel Cheng</name> <sex>man</sex> </emp> </emps>